Dear Sir/Madam:
Is a database engine responsible for parsing, optimizing and
executing a query?(i.e. a query engine) Or responsible for transaction
related operation, such as recovery and concurrency control? Or
anything else?

Sincerely:
eric

Hi,

The same subject can be discussed here:
http://forums.oracle.com/forums/thre...29915&tstart=0

Thanks,
Bodgan Coman, Oracle